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    <title>Snap Interaction</title>
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        <div class="span12">
          <h4 id="title">Snap Interaction</h4>
          <div id="map" class="map"></div>
<form id="options-form" automplete="off">
  <div class="radio">
    <label>
      <input type="radio" name="interaction" value="draw" id="draw" checked>
      Draw &nbsp;
    </label>
  </div>
  <div class="radio">
    <label>
      <input type="radio" name="interaction" value="modify">
      Modify &nbsp;
    </label>
  </div>
  <div class="form-group">
    <label>Draw type &nbsp;</label>
    <select name="draw-type" id="draw-type">
      <option value="Point">Point</option>
      <option value="LineString">LineString</option>
      <option value="Polygon">Polygon</option>
      <option value="Circle">Circle</option>
    </select>
  </div>
</form>

        </div>
      </div>

      <div class="row-fluid">
        <div class="span12">
          <p id="shortdesc">Example of using the snap interaction together with draw and modify interactions.</p>
          <div id="docs"><p>Example of using the snap interaction together with draw and modify interactions. The snap interaction must be added last, as it needs to be the first to handle the <code>pointermove</code> event.</p></p>
</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.interaction.Draw.html" title="API documentation for ol.interaction.Draw">ol.interaction.Draw</a></li>,<li><a href="../apidoc/ol.interaction.Modify.html" title="API documentation for ol.interaction.Modify">ol.interaction.Modify</a></li>,<li><a href="../apidoc/ol.interaction.Select.html" title="API documentation for ol.interaction.Select">ol.interaction.Select</a></li>,<li><a href="../apidoc/ol.interaction.Snap.html" title="API documentation for ol.interaction.Snap">ol.interaction.Snap</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Snap Interaction</textarea>
          <textarea class="hidden" name="description">Example of using the snap interaction together with draw and modify interactions.</textarea>
          <textarea class="hidden" name="js">var raster &#x3D; new ol.layer.Tile({
  source: new ol.source.OSM()
});

var vector &#x3D; new ol.layer.Vector({
  source: new ol.source.Vector(),
  style: new ol.style.Style({
    fill: new ol.style.Fill({
      color: &#x27;rgba(255, 255, 255, 0.2)&#x27;
    }),
    stroke: new ol.style.Stroke({
      color: &#x27;#ffcc33&#x27;,
      width: 2
    }),
    image: new ol.style.Circle({
      radius: 7,
      fill: new ol.style.Fill({
        color: &#x27;#ffcc33&#x27;
      })
    })
  })
});

var map &#x3D; new ol.Map({
  layers: [raster, vector],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [-11000000, 4600000],
    zoom: 4
  })
});

var Modify &#x3D; {
  init: function() {
    this.select &#x3D; new ol.interaction.Select();
    map.addInteraction(this.select);

    this.modify &#x3D; new ol.interaction.Modify({
      features: this.select.getFeatures()
    });
    map.addInteraction(this.modify);

    this.setEvents();
  },
  setEvents: function() {
    var selectedFeatures &#x3D; this.select.getFeatures();

    this.select.on(&#x27;change:active&#x27;, function() {
      selectedFeatures.forEach(selectedFeatures.remove, selectedFeatures);
    });
  },
  setActive: function(active) {
    this.select.setActive(active);
    this.modify.setActive(active);
  }
};
Modify.init();

var optionsForm &#x3D; document.getElementById(&#x27;options-form&#x27;);

var Draw &#x3D; {
  init: function() {
    map.addInteraction(this.Point);
    this.Point.setActive(false);
    map.addInteraction(this.LineString);
    this.LineString.setActive(false);
    map.addInteraction(this.Polygon);
    this.Polygon.setActive(false);
    map.addInteraction(this.Circle);
    this.Circle.setActive(false);
  },
  Point: new ol.interaction.Draw({
    source: vector.getSource(),
    type: &#x27;Point&#x27;
  }),
  LineString: new ol.interaction.Draw({
    source: vector.getSource(),
    type: &#x27;LineString&#x27;
  }),
  Polygon: new ol.interaction.Draw({
    source: vector.getSource(),
    type: &#x27;Polygon&#x27;
  }),
  Circle: new ol.interaction.Draw({
    source: vector.getSource(),
    type: &#x27;Circle&#x27;
  }),
  getActive: function() {
    return this.activeType ? this[this.activeType].getActive() : false;
  },
  setActive: function(active) {
    var type &#x3D; optionsForm.elements[&#x27;draw-type&#x27;].value;
    if (active) {
      this.activeType &amp;&amp; this[this.activeType].setActive(false);
      this[type].setActive(true);
      this.activeType &#x3D; type;
    } else {
      this.activeType &amp;&amp; this[this.activeType].setActive(false);
      this.activeType &#x3D; null;
    }
  }
};
Draw.init();


/**
 * Let user change the geometry type.
 * @param {Event} e Change event.
 */
optionsForm.onchange &#x3D; function(e) {
  var type &#x3D; e.target.getAttribute(&#x27;name&#x27;);
  var value &#x3D; e.target.value;
  if (type &#x3D;&#x3D; &#x27;draw-type&#x27;) {
    Draw.getActive() &amp;&amp; Draw.setActive(true);
  } else if (type &#x3D;&#x3D; &#x27;interaction&#x27;) {
    if (value &#x3D;&#x3D; &#x27;modify&#x27;) {
      Draw.setActive(false);
      Modify.setActive(true);
    } else if (value &#x3D;&#x3D; &#x27;draw&#x27;) {
      Draw.setActive(true);
      Modify.setActive(false);
    }
  }
};

Draw.setActive(true);
Modify.setActive(false);

// The snap interaction must be added after the Modify and Draw interactions
// in order for its map browser event handlers to be fired first. Its handlers
// are responsible of doing the snapping.
var snap &#x3D; new ol.interaction.Snap({
  source: vector.getSource()
});
map.addInteraction(snap);
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;form id&#x3D;&quot;options-form&quot; automplete&#x3D;&quot;off&quot;&gt;
  &lt;div class&#x3D;&quot;radio&quot;&gt;
    &lt;label&gt;
      &lt;input type&#x3D;&quot;radio&quot; name&#x3D;&quot;interaction&quot; value&#x3D;&quot;draw&quot; id&#x3D;&quot;draw&quot; checked&gt;
      Draw &amp;nbsp;
    &lt;/label&gt;
  &lt;/div&gt;
  &lt;div class&#x3D;&quot;radio&quot;&gt;
    &lt;label&gt;
      &lt;input type&#x3D;&quot;radio&quot; name&#x3D;&quot;interaction&quot; value&#x3D;&quot;modify&quot;&gt;
      Modify &amp;nbsp;
    &lt;/label&gt;
  &lt;/div&gt;
  &lt;div class&#x3D;&quot;form-group&quot;&gt;
    &lt;label&gt;Draw type &amp;nbsp;&lt;/label&gt;
    &lt;select name&#x3D;&quot;draw-type&quot; id&#x3D;&quot;draw-type&quot;&gt;
      &lt;option value&#x3D;&quot;Point&quot;&gt;Point&lt;/option&gt;
      &lt;option value&#x3D;&quot;LineString&quot;&gt;LineString&lt;/option&gt;
      &lt;option value&#x3D;&quot;Polygon&quot;&gt;Polygon&lt;/option&gt;
      &lt;option value&#x3D;&quot;Circle&quot;&gt;Circle&lt;/option&gt;
    &lt;/select&gt;
  &lt;/div&gt;
&lt;/form&gt;
</textarea>
          <input type="hidden" name="resources" value="https://openlayers.org/en/v4.6.5/css/ol.css,https://openlayers.org/en/v4.6.5/build/ol.js">
          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Snap Interaction&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;form id&#x3D;&quot;options-form&quot; automplete&#x3D;&quot;off&quot;&gt;
      &lt;div class&#x3D;&quot;radio&quot;&gt;
        &lt;label&gt;
          &lt;input type&#x3D;&quot;radio&quot; name&#x3D;&quot;interaction&quot; value&#x3D;&quot;draw&quot; id&#x3D;&quot;draw&quot; checked&gt;
          Draw &amp;nbsp;
        &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class&#x3D;&quot;radio&quot;&gt;
        &lt;label&gt;
          &lt;input type&#x3D;&quot;radio&quot; name&#x3D;&quot;interaction&quot; value&#x3D;&quot;modify&quot;&gt;
          Modify &amp;nbsp;
        &lt;/label&gt;
      &lt;/div&gt;
      &lt;div class&#x3D;&quot;form-group&quot;&gt;
        &lt;label&gt;Draw type &amp;nbsp;&lt;/label&gt;
        &lt;select name&#x3D;&quot;draw-type&quot; id&#x3D;&quot;draw-type&quot;&gt;
          &lt;option value&#x3D;&quot;Point&quot;&gt;Point&lt;/option&gt;
          &lt;option value&#x3D;&quot;LineString&quot;&gt;LineString&lt;/option&gt;
          &lt;option value&#x3D;&quot;Polygon&quot;&gt;Polygon&lt;/option&gt;
          &lt;option value&#x3D;&quot;Circle&quot;&gt;Circle&lt;/option&gt;
        &lt;/select&gt;
      &lt;/div&gt;
    &lt;/form&gt;
    &lt;script&gt;
      var raster &#x3D; new ol.layer.Tile({
        source: new ol.source.OSM()
      });

      var vector &#x3D; new ol.layer.Vector({
        source: new ol.source.Vector(),
        style: new ol.style.Style({
          fill: new ol.style.Fill({
            color: &#x27;rgba(255, 255, 255, 0.2)&#x27;
          }),
          stroke: new ol.style.Stroke({
            color: &#x27;#ffcc33&#x27;,
            width: 2
          }),
          image: new ol.style.Circle({
            radius: 7,
            fill: new ol.style.Fill({
              color: &#x27;#ffcc33&#x27;
            })
          })
        })
      });

      var map &#x3D; new ol.Map({
        layers: [raster, vector],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [-11000000, 4600000],
          zoom: 4
        })
      });

      var Modify &#x3D; {
        init: function() {
          this.select &#x3D; new ol.interaction.Select();
          map.addInteraction(this.select);

          this.modify &#x3D; new ol.interaction.Modify({
            features: this.select.getFeatures()
          });
          map.addInteraction(this.modify);

          this.setEvents();
        },
        setEvents: function() {
          var selectedFeatures &#x3D; this.select.getFeatures();

          this.select.on(&#x27;change:active&#x27;, function() {
            selectedFeatures.forEach(selectedFeatures.remove, selectedFeatures);
          });
        },
        setActive: function(active) {
          this.select.setActive(active);
          this.modify.setActive(active);
        }
      };
      Modify.init();

      var optionsForm &#x3D; document.getElementById(&#x27;options-form&#x27;);

      var Draw &#x3D; {
        init: function() {
          map.addInteraction(this.Point);
          this.Point.setActive(false);
          map.addInteraction(this.LineString);
          this.LineString.setActive(false);
          map.addInteraction(this.Polygon);
          this.Polygon.setActive(false);
          map.addInteraction(this.Circle);
          this.Circle.setActive(false);
        },
        Point: new ol.interaction.Draw({
          source: vector.getSource(),
          type: &#x27;Point&#x27;
        }),
        LineString: new ol.interaction.Draw({
          source: vector.getSource(),
          type: &#x27;LineString&#x27;
        }),
        Polygon: new ol.interaction.Draw({
          source: vector.getSource(),
          type: &#x27;Polygon&#x27;
        }),
        Circle: new ol.interaction.Draw({
          source: vector.getSource(),
          type: &#x27;Circle&#x27;
        }),
        getActive: function() {
          return this.activeType ? this[this.activeType].getActive() : false;
        },
        setActive: function(active) {
          var type &#x3D; optionsForm.elements[&#x27;draw-type&#x27;].value;
          if (active) {
            this.activeType &amp;&amp; this[this.activeType].setActive(false);
            this[type].setActive(true);
            this.activeType &#x3D; type;
          } else {
            this.activeType &amp;&amp; this[this.activeType].setActive(false);
            this.activeType &#x3D; null;
          }
        }
      };
      Draw.init();


      /**
       * Let user change the geometry type.
       * @param {Event} e Change event.
       */
      optionsForm.onchange &#x3D; function(e) {
        var type &#x3D; e.target.getAttribute(&#x27;name&#x27;);
        var value &#x3D; e.target.value;
        if (type &#x3D;&#x3D; &#x27;draw-type&#x27;) {
          Draw.getActive() &amp;&amp; Draw.setActive(true);
        } else if (type &#x3D;&#x3D; &#x27;interaction&#x27;) {
          if (value &#x3D;&#x3D; &#x27;modify&#x27;) {
            Draw.setActive(false);
            Modify.setActive(true);
          } else if (value &#x3D;&#x3D; &#x27;draw&#x27;) {
            Draw.setActive(true);
            Modify.setActive(false);
          }
        }
      };

      Draw.setActive(true);
      Modify.setActive(false);

      // The snap interaction must be added after the Modify and Draw interactions
      // in order for its map browser event handlers to be fired first. Its handlers
      // are responsible of doing the snapping.
      var snap &#x3D; new ol.interaction.Snap({
        source: vector.getSource()
      });
      map.addInteraction(snap);
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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